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Despite the prevalence of essential hypertension, its underlying genetic basis has not been elucidated due to the complexities of its determinants. To identify a hypertension susceptibility gene, we used an approach that integrates molecular, transgenic, and genetic analysis using Dahl salt-sensitive (S) and Dahl salt-resistant (R) rats ascertained for genotype and phenotype. To determine the role of the Dahl S Q276L alpha1 Na,K-ATPase gene variant, we developed transgenic Dahl S rats bearing the Dahl R wild-type (wt) alpha1 Na, K-ATPase cDNA directed by the cognate wt promoter region, Tg[wtalpha1]. Transgenic Dahl S rats exhibited less salt-sensitive hypertension, less hypertensive renal disease, and longer life span when compared with non-transgenic Dahl S controls. Total chromosome 2 linkage analysis of F2(SxR) male rats detects cosegregation of the alpha1 Na,K-ATPase locus with salt-sensitive hypertension. These data support the alpha1 Na,K-ATPase gene as a susceptibility gene for salt-sensitive hypertension in the Dahl S rat model, and provide the basis for the study of the alpha1 Na,K-ATPase locus in human hypertension.

The alpha1 Na,K-ATPase gene is a susceptibility hypertension gene in the Dahl salt-sensitiveHSD rat.